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(No Model.) I I E. M. HAMILTON.

. TELEGRAPH KEY. No. 379,063. I Patented Mar. 6, 1888.

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UNITED STATES PATENT OFFICE.

HAMILTON, OF NEW YORK, N. Y.

TELEGRAPH-KEY.

SPECIFICATION forming part of Letters Patent No. 379,063, dated March 6, 1888.

Application filed August 29. 1887. Serial No. 248,122.

To all whom it may concern.-

Be it known that I, EMERY M. HAMILTON, of the city of New York, in the county and State of New York, have invented an improvement in Telegraph-Keys, of which the following is a specification, reference being had to the accompanying drawings, forming part of the same, in which- Figure 1 is a side elevation of a telegraphkey containing my invention. Fig. 2 is a plan of the same, and Fig. 3 is a plan or upper face view of the keylever detached from its connection with the key. 7

My invention is an improvement upon th telegraphkey for which Letters Patent of the United States were granted to me dated December 26, 1882, and numbered 269,521; and it consists in the special devices herein described and claimed.

A is the frame or plate on which the work- 'ing parts are mounted.

B is the key-lever. It is made in the form of a cross, as shown in the drawings, and may be cut out of sheet metal of suitable thickness. The long arm a is provided with a contact point, I), for making and breaking contact with the anvil c, insulated on the plate A.

d is the spring, located between the fulcrum of the lever and the said contact-point b, and near the said fulcrum, for breaking the circuit by raising the said long end of the lever. The short end f of the lever carries theset screw 9, for regulating the distance of vibration of the lever.

h h are separate studs fixed in the plate A, on which the lever B is fulcrumed. Each is provided with an overhanging lipyi i, beveled to a knife-edge on the under side. Near the extremities of the cross-arms j of the lever on their upper faces are made recesses k 70, with inclined sides meeting at the bottom at an angle somewhat greater than the angle formed by the inclined sides of the lips z r", so

(No model.)

When the lever is placed with the ends of its cross-arms under the overhanging lips t t" and the lips adjusted in the recesses h h, the spring d, together with either the contactpoints or the set-screw g, maintains the lever in place, and the separate lipst' t" and recesses h it constitute durable easilyoperating fulcrumjoints that insure at all times a perfect make and break at the contact-points without any rubbing or shifting motion of one point on the other-a motion which is very deleterious to the action of a telegraph-key.

Without departing from the spirit of the invention, the position of the described lips t i on the studsp p and the recesses it It in the cross-arms of the lever B may be reversed, the lips in the form of projections being formed on the lever and the recesses inthe under face of overhanging projections on the studs.

What I claim as my in vention, and desire to secure by Letters Patent. is-

In a telegraph-key, the cruciform lever B, made of a single piece of metal and provided with. a set screw, 9, carried on the short arm f, and with a contact-point, I), carried on its long arm a, and the spring 01, located between the fulcrum of the lever and the said contactpoint, the said lever being fulcrumed near the extremities of its cross-armsj j on the separate studs h h by the lips t i and the recesses It It, all constructed and combined to operate as and for the purpose described.

EMERY M. HAMILTON.

\Vitnesses:

. A. G. N. VERMILYA,

ARDEN S. Frrcn. 

